This Synapse Transmission Control Module (TCM) is a fully remanufactured, stock‑calibration Allison controller for 2009–2010 GM 6.6L LMM Duramax trucks, built as a direct replacement for failed A50/T14 modules while retaining factory shift strategies and emissions compliance. It is a plug‑and‑play exchange unit that arrives VIN‑programmed for your truck, making it ideal for owners who want OEM‑correct operation and reliability.
The Synapse S72‑1G00910GD “2009–2010 Duramax – Allison TCM Exchange” is a direct‑fit remanufactured Allison Transmission Control Module for 2009–2010 Chevrolet and GMC 6.6L LMM Duramax trucks. This stock‑replacement unit restores proper communication and shift control to trucks suffering from common A50/T14 TCM failures, without altering engine or transmission performance beyond factory specifications.
Application: 2009–2010 Chevrolet and GMC 6.6L LMM Duramax equipped with Allison automatic transmission.
Typical vehicles covered:
2009–2010 GMC Sierra 2500HD / 3500HD 6.6L Duramax.
2009–2010 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax.
TCM family: A50 / T14 Allison TCM used from 2009–2015; this listing is specifically calibrated for 2009–2010 LMM applications.
Service type: Exchange remanufactured TCM (you receive a rebuilt unit and return your original core).
Calibration: Stock GM transmission calibration only – no PPEI or other custom tuning included; this is an OEM‑style replacement for emissions‑controlled trucks.
Brand: Synapse
SKU / Item #: S72‑1G00910GD
Condition: New, fully remanufactured control module
OEM cross‑reference (examples): A5100S92, A5100NC6, 19431596, 24256861, 24259874, 24257038, 24266710
UPC: 645716739778
Weight: Approx. 3 lb
Package dimensions: Approx. 5 in x 10 in x 10 in
Electrical: Designed for OEM 12‑volt GM truck electrical systems within factory voltage ranges
Corrects TCM‑related limp‑mode, harsh shifting, and gear‑selection issues while preserving GM’s original shift schedules, torque‑converter strategy, and torque‑management functions.
Ideal for stock or near‑stock 2009–2010 LMM Duramax trucks in emissions‑controlled regions that require OEM‑style operation.
Each remanufactured TCM is pre‑programmed to your truck’s specific VIN, so in most cases no dealer‑level reflash is required after installation.
Direct‑fit connectors and original‑style mounting points allow installation with basic tools; most shops can complete the swap in under an hour once the module is accessible.
A failing TCM can command incorrect line pressures or converter behavior, accelerating clutch wear or causing overheating; replacing it early helps protect your Allison from further damage.
Restored logic ensures proper coordination between engine torque‑management and shift events, critical on LMM trucks that tow or see heavy use.
The exchange module is fully disassembled, inspected, and rebuilt; known failure‑point components on the circuit board are replaced or upgraded where appropriate.
Each TCM is bench‑tested for CAN communication, input processing, and driver output function before being programmed with the correct 2009–2010 calibration.
Order & info collection
Select the 2009–2010 Duramax – Allison TCM Exchange on norcaldieselperformance.com and complete checkout with accurate vehicle data and VIN.
Remanufacture & programming
A remanufactured A50/T14 TCM is configured for your VIN and loaded with the correct stock LMM transmission calibration.
Shipping
The ready‑to‑install TCM ships from a 100% USA‑based repair/reman facility, typically via FedEx ground; expedited options are often available at checkout.
Installation
Install the replacement TCM, verify communication, and road test the truck to confirm normal shift operation.
Core return
Ship your original TCM back, packaged with several inches of padding on all sides; failing to return a rebuildable core within the specified window may result in a core charge as outlined in your NorCal order.
Your original A50/T14 TCM typically must meet the following standards to qualify as a rebuildable core:
No fire damage.
No significant flood or heavy corrosion damage.
Must be an A50 or T14 Allison TCM compatible with 2009–2010 LMM applications.
Circuit board and housing intact with all original components in place; prior repair attempts are acceptable if components are still present and not burned beyond repair.
Core charge amounts and return deadlines are governed by NorCal Diesel Performance’s current policies, which may differ from the reference numbers used by the reman facility; always follow the terms displayed in your cart and order confirmation.
A failing A50/T14 TCM on LMM trucks will show many of the same problems seen on later LML trucks. This stock exchange unit is intended to resolve issues that originate in the TCM electronics rather than in the transmission hard parts.
Limp‑mode operation with the truck stuck in a single gear (often 3rd or 5th) despite a mechanically sound transmission.
Harsh, erratic, or delayed shifts; gear flare between upshifts; or refusal to downshift while towing or under moderate throttle.
Loss of manual/tap‑shift function in M range even though PRNDL display appears normal.
“Service Transmission” or similar warning messages associated with shifting or gear‑selection issues.
Intermittent no‑crank or no‑start due to TCM‑ECM communication failure on the high‑speed CAN bus.
U0101 – Lost Communication with TCM.
P0700 – Transmission Control System Malfunction (ECM flag indicating a transmission‑side fault).
P0711 / P0713 – Transmission Fluid Temperature Sensor Performance / High Input when TCM internal sensor circuitry is affected.
P0729–P0736 – Gear ratio errors if the module can no longer accurately control or monitor shifts.
If diagnostics point to internal clutch slip, torque‑converter failure, bad wiring, or poor grounds, those root causes must be addressed; replacing the TCM alone will not fix mechanical or harness issues.
Duration: 2‑year, no‑hassle warranty on the remanufactured TCM from the original purchase date.
Coverage:
Defects in materials and workmanship of the remanufactured TCM under normal automotive use.
If a covered failure occurs during the warranty period, the provider may repair the unit again, replace it, or refund the repair cost at its discretion.
Failures caused by external issues such as faulty wiring, improper installation, blown fuses, or failed transmission components.
Damage from fire, collision, or significant water intrusion.
Incidental and consequential damages, including towing, rental vehicles, lost income, or downtime.
Coverage is non‑transferable and applies only to the original purchaser.
For terms on this 2009–2010 TCM exchange, always refer to NorCal Diesel Performance’s current online policies and your specific order documentation.
No. This part is a stock‑replacement Allison TCM with factory‑style calibration only; it does not include PPEI or any other custom transmission tuning. PPEI tuning is only available for 2011–2015 TCM listing and not compatible with 2009–2010 LMM trucks.
Because it retains OEM‑style transmission calibration and does not alter engine tuning, this stock replacement TCM is suitable for emissions‑controlled applications; however, customers must ensure compliance with any local or state regulations that apply to their specific vehicle configuration.
In most cases, no. The TCM is programmed to your VIN and correct 2009–2010 calibration before shipment, so once installed it should communicate with the ECM and function like a factory unit without additional dealer flashing.
If limp‑mode, harsh shifting, or loss of tap‑shift is due to internal TCM failure or logic corruption, this remanufactured module is designed to correct those issues. If the root cause is mechanical (burned clutches, bad converter) or wiring‑related, those problems must be repaired separately.
The reference program requires core return within 30 calendar days from the date of purchase. Promptly returning your original A50/T14 ensures proper core credit and keeps overall costs down.
For 2009–2010 LMM Duramax owners whose trucks are down with TCM‑related limp‑mode or communication faults, this Synapse 2009–2010 Duramax Allison TCM Exchange offers a VIN‑programmed, stock‑calibration, plug‑and‑play solution that restores factory shift control without introducing custom tuning or emissions complications.
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